D&Dtools1

Benefit

Whenever you are subject to a power from the telepathy discipline (regardless of whether the power is harmful or beneficial to you), the manifester must make a Will saving throw against a DC of 10 + 1/2 your character level + your Cha modifier, and takes an additional 2d6 points of damage, plus 2d6 points from your Hostile Mind feat, for a total of 4d6 points of damage. The benefit of this feat applies only to psionic powers and psi-like abilities. This is an exception to the psionics--magic transparency rule (EPH 155).

Special

You cannot take or use this feat if you have the ability to use powers (if you have a power point reserve).